I have been playing amnesia for quite some time without any problems with the patch but I always had this problem. When I press Alt-Tab or the Start Button and Amnesia minimizes, the mouse is always stuck at the top-left corner of the screen and I can't move it whatever I do. That also happens sometimes with the launcher. What can I do to fix this?

The way I fixed this was, I downloaded ShiftWindow.
Then set up a rule for Amnesia to run in somewhat fullscreen. (Actually just position the window the border is outside the view and make it fit the screen. Trial and error simply)

The only downside of this is that you need to run ShiftWindow when you want to play Amnesia, but it isn't much of a problem. (can't give you any screenshots, I'm on Linux ATM)

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My avatar used to shape shift, but that is no longer the case.